In forex trading, commission refers to the fee that a trader pays to their broker for facilitating their trades. This fee can be charged in a number of ways, such as a fixed fee per trade or a percentage of the trade value. Some brokers may offer commission-free trading, but may instead make money through spreads, which is the difference between the bid and ask price of a currency pair. The commission charged by a broker can impact the profitability of a trader’s strategy, so it is important to consider commission rates when selecting a broker.